A Silicon Valley real estate agent told her clients, “There is no radon in California. You don’t need to worry about it.” The couple purchased a home in Sunnyvale, CA, which has some of the higher radon levels in Santa Clara County. Another home in Sunnyvale had 29 picoCuries/liter (pCi/L), more than 8 times the EPA action level (4 pCi/L). A home in Los Gatos had 56 pCi/L, which is 14 times the action level.